p.4

Bouteloua.-A portion of the compound spike, of the natural size (1); and a spikelet displayed and magnified (2), the flowers raised out of the glumes.

Gymnopogon.-Inflorescence of G. racemosus, reduced in size (1); and a magnified spikelet with the parts displayed (2).

Cynodon.-Inflorescence, of digitate spikes (1); a spikelet magnified and displayed, showing a perfect flower and a rudiment (2).

Dactyloctenium.-Inflorescence of D. Egyptiacum, of digitate spikes (1); one of the spikelets magnified (2); the fruit magnified (3), showing the seed loose in the thin pericarp (utricle); and (4) the wrinkled seed more magnified.

Eleusine.-One of the spikes from the digitate inflorescence of E. Indica (1); a magnified spikelet (2); the same with the flowers more displayed (3); a flower from the last showing its parts (4); the fruit magnified, showing the seed loose in the utricle (5); and the wrinkled seed detached (6).

Leptochloa.-Small portion of the inflorescence of L. fascicularis (1); one of its spikelets displayed and magnified (2); an open flower of the same (3).

Tab IV.

Tricuspis.-Magnified spikelet of T. seslerioides (1); the same displayed and the lowest flower open (2); back view of the lower paleae spread out (3).

Dupontia, or, as it should be, Graphephorum (see Addenda, p.c).-A magnified spikelet of Dupontia Cooleyi or Graphephorum melicoides, displayed (1), a part of the hairy rhachis and one flower of the same (2).

Diarrhena.-A spikelet of D. Americana, enlarged (1); the grain and paleae (2).

Dactylis.-A spikelet of D. glomerata magnified and displayed.

Koeleria.-A magnified spikelet of K. cristata, expanded, showing the glumes, the three flowers, and a rudiment (1); lower half of a lower palea, partly spread open (2); it is much more folded and keeled in its natural condition.

Eatonia.-A magnified spikelet of E. obtusata, expanded, showing the glumes, the two flowers, and a rudiment.